• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:AT509983A4
    申请号:T0138810
    申请日:2010-08-19
    公开日:2012-01-15
    发明作者:Werner Ing Kappelmueller；Stefan Eppich
    申请人:Engel Austria Gmbh；
    IPC主号:
    专利说明:

    1
    The invention relates to a lubricating device for an injection molding machine with a container for lubricant, a supply line for lubricant from the container to a lubrication point of the injection molding machine, a drain line for lubricant from the lubrication point and a Zulaufmengenmessvorrichtung for lubricant in the supply line, and an injection molding machine with such a lubricating device.
    Since in injection molding machines, especially in the toggle lever systems of injection molding machines always very high pressures and frictional forces occur, a good supply of lubricant must be given in the individual heavily loaded areas. Injection molding machines are also increasingly used for clean room applications, which is why it is particularly important to form the entire lubricating device for the injection molding as possible in a closed system, so that no or as little lubricant (lubricating oil or grease) leaking and dirty the work area or the ambient air.
    For this purpose, it is known, for example, from AT 505 342 B1 to produce a closed lubrication system for an injection molding machine, wherein the lubricant is made available via a central lubricant pump. At each lubrication point in the toggle lever system, a metering valve is arranged, which presses a certain amount of lubricant into the lubrication point during the pressure build-up in the feed lines produced by the lubricant pump. After pressure reduction in the lubrication point, the metering valve refills and is ready for the next lubrication cycle. This system is monitored by two pressure switches, an opener, which monitors the safe pressure reduction, and a closer, which monitors the pressure build-up. This monitoring thus detects pressure build-up and pressure reduction and thus leaks in the supply to the metering valve, as in a leak, a pressure build-up is no longer possible.
    A disadvantage of these previous versions is that clogged lines in general or leaks after the metering valve {Zulaufmengenmessvorrichtung) can not be detected.
    The object of the present invention is therefore to provide a comparison with the prior art improved lubrication device for an injection molding machine. 68519 22 / sk 2
    In particular, a leakage monitoring in the entire lubricating device or at least after the feed quantity measuring device should be made possible.
    This is solved for a device having the features of the preamble of claim 1 by a lubricant quantity measuring device which is arranged after the lubrication point. This makes it possible to determine the lubricant consumption not only before but also after the lubrication point, whereby a significantly improved leakage monitoring is given.
    According to a particularly preferred embodiment of the invention may be provided that by the lubricant quantity measuring device and the feed quantity measuring device, the respective measured amount of lubricant to a
    Memory of a monitoring device can be transmitted, which compares the respective measured and stored amounts of lubricant with each other and a deviation of the lubricant amounts from each other a corresponding signal, preferably a warning signal outputs. This monitoring device may be part of a control unit of the entire injection molding machine. It is essential that the measured amounts of lubricant are compared, so that a conclusion on the consumption or - too high consumption - on a leak is possible.
    On the one hand, it can be provided that the lubricant quantity measuring device is arranged in the discharge line and the flow rate of lubricant through the
    Drain line measures. On the other hand, it can also be provided that the
    Lubricant amount measuring device is arranged in or on a return collection container and measures the capacity of the return collection container. By one of these variants, a total monitoring can be performed on or before the end of the lubricating device, so that a leak in the drain line is registered.
    However, it may be particularly preferable that both a
    Lubricant quantity measuring device is arranged in the return line, as well as in or on the return collection container. When the lubricant amount measuring device is disposed in the drain line, it may be in the form of, for example, an impeller, a turbine wheel or a gear. It can also be designed magnetically or inductively, as a screw spindle, as a vortex meter or as a drop sensor. 3
    In order to achieve a compact design, it can be provided that the feed quantity measuring device is designed in the form of a metering element, which receives lubricant via the feed line and assigns lubricating agent in definable amounts of lubricant. These determinable quantities can be transmitted to the respective dosing element as control signals, for example, by a control or regulation unit. These quantities may vary depending on the load and measured consumption by a lubricant meter.
    If the feed quantity measuring device is designed in the form of a pump, preferably the main pump of the lubricating device, which pumps definable or detectable amounts of lubricant into the supply line, leakage monitoring can take place in the entire lubricant conveying region, which already starts with the lubricant pump. Since the flow rate per unit time can be determined by the pump or can be detected by a part of the feed quantity measuring device, it is always understandable how much lubricant was pumped into the lubricant circuit.
    Particularly preferably, it can be provided that both the pump and at least one metering element are designed as inlet quantity measuring devices of the lubricating device, so that when leakage occurs, the location of the leakage (eg in the supply line or in the lubrication point) can be narrower and thus detected more quickly ,
    Basically, it is possible with the present invention to allow a sequential, serial supply of individual lubrication points, then only after the last lubrication point or preferably after each lubrication point, a lubricant quantity measuring device is provided and monitors the (respective) consumption and thus infer leaks.
    Preferably, however, the subject lubricating device is used in a lubricating device with a parallel supply for lubrication points (parallel in this context, of course, not to be understood as geometrically parallel, but as opposed to serial lubricant supply). Therefore, a very particularly preferred embodiment of the lubricating device, a main supply line for lubricant, leading away from the container, at least two, parallel from the main supply line leading away supply lines, each having a Zulaufmengenmessvorrichtung, preferably a metering element, wherein via the at least two supply lines 4 each have a lubrication point can be supplied with lubricant, at least two of the lubrication points parallel leading away drain lines for lubricant and at least one, arranged according to the respective lubrication point Schmiermittelmengenmessvorrichtung, Thus, each individual lubrication point and each inlet and outlet line can be monitored, making the lubricating device even better suited for clean room applications is.
    For this purpose, it can be particularly preferably provided that in each of the at least two drain lines, a lubricant quantity measuring device is arranged.
    Protection is also desired for an injection molding machine with a lubricating device according to one of claims 1 to 7.
    Further details and advantages of the present invention will be explained in more detail below with reference to the description of the figures with reference to the exemplary embodiments illustrated in the drawings. Show:
    1 is a side view of an injection molding machine with a toggle lever system,
    2 shows schematically the lubricating device for a toggle lever system of a
    Injection molding machine and
    Fig. 3 shows schematically the lubricating device including monitoring device.
    Fig. 1 shows a side view of an injection molding machine 1, wherein between the clamping plates 22, a toggle lever system 21 is arranged. This toggle lever system 21 has a plurality of lever joints 7, which are formed by levers 9 and bolts 10. In these individual lever joints 7, the lubrication points 11 are formed, which are supplied by the lubricating device with lubricant 4. Of course, lubrication points 11 may additionally or alternatively be provided at other or further points of the injection molding machine 1.
    FIG. 2 shows a lubricating device for the lubrication points 11 (11a to 11f) which can be seen between the levers 9 and the bolts 10. Basically, in the exemplary embodiment shown, a lubricant device 4 is pumped from a container 2 by a pump 8 driven by the motor 20 into a main supply line 19. In this area, a pressure relief valve 13 may already be arranged to prevent overpressure. It is also possible that after the pump 8 immediately 5
    Inlet amount measuring device 14 detects the output from the pump 8 amount M of lubricant 4 and measures. But may also be particularly preferably provided that the pump 8 itself forms the first feed quantity measuring device 14.
    Then branch off from the main supply line 19, the supply lines 5a, 5b, 5c, 5d, 5e and 5f, each leading to a lubrication point 11a to 11f in the toggle lever system 21. In each of these feed lines 5 a to 5 f, a feed quantity measuring device 14 a to 14 f (preferably designed as a metering element) is arranged and assigns a definable amount M of lubricant 4 to the respective lubricating point 11 a to 11 f. From the lubrication points 11a to 11f run each discharge lines 3a to 3f and pass through a main drain line 23 in a return collection container 2a. There, in addition to or as an alternative to the lubricant quantity measuring devices 16a to 16f, a quantity measurement can take place. This can be done for example by a weight measurement of the return tank 2a by a lubricant amount measuring device 16 '. Alternatively, the lubricant quantity measuring device 16 "is designed as a level meter of the return container 2a and can inductively, optically, ultrasonically, capacitively or by radar monitor the filling level of the return container 2a and forward a corresponding signal S to the monitoring device 18. However, it is also possible for a lubricant quantity measuring device 16 "'to be arranged in the main drain line 23, which, like the measuring devices 16a to 16f, in the form of impellers, turbine wheels, gear wheels, screw spindles, swirl blades or magnetic or inductive, the flow rate through the respective line 23 and 3a to 3d measure and forward to the monitoring device 18.
    In principle, it should not be ruled out that only a single container 2 is provided, into which the lubricant 4 runs off via the drain line 3 shown in dashed lines with a filter 15.
    FIG. 3 schematically shows that in each case a measuring signal S is sent to a monitoring device 18 by the feed quantity measuring device 14 and the lubricant quantity measuring device 16. This monitoring device 18 has a memory 17, in which in a logical table the received measurement data S are stored, wherein according to the feed amount measuring device 14, a feed amount M14 is stored, while according to the measurement signal S of the lubricant amount measuring device 16, a discharge amount Mi6 is stored. In this memory 17, of course, a corresponding comparison table for each measuring device
    14a to 14f and 16a to 16f be stored or storable. On the basis of these quantities M14 and Mi6 received by way of signal technology, a comparison calculation is carried out by the monitoring device 18. As soon as this calculation results in a difference between the inflow quantity M14 and the outflow quantity M16, a warning signal W is output either acoustically or by signal technology to a corresponding higher-order control unit. Of course, the measured deviation may have certain tolerances that correspond to the natural lubricant consumption in the lubrication point 11. This natural difference can be supported by corresponding empirical values. That is, as soon as the lapse amount ΜΊ6 is no longer an expected value, the warning signal W should be outputted. In principle, the feed quantity Mu and the discharge quantity M16 can correspond to a specific volume value or can also be specified as a volume value as a function of a time unit. Basically, the memory 17 of the monitoring device 18 can be constantly updated by the newly received measuring signals S, whereby storing of past measured values M14 and Mi6 makes sense for a calculation with expected values.
    Thus, a lubricating device for an injection molding machine 1 is shown by the present invention, in which a leakage monitoring is also made possible after the lubrication points 11. With this idea, leaks or even closed lubrication points 11 or lines 5 and 3 can be detected, for example, by performing a measurement of the oil level in the return tank 2a. Since the amount of lubricant per lubrication cycle in a closed system (for example, by a corresponding measurement of the pump 8 itself) is known, one can determine whether this amount arrives in the return tank 2a. Alternatively or additionally, a flow measurement in the or the Rückiaufleitungen 3 and feed lines 5 are performed and made a comparison with the funded amount.
    Innsbruck, 18 August 2010
    权利要求:
    Claims (9)
    [1]
    1 Claims t. Lubricating device for an injection molding machine (1) with - a container (2) for lubricant (4), - a supply line (5) for lubricant (4) from the container (2) to a Schmierstelie (11) of the injection molding machine (1), - one Drain line (3) for lubricant (4) from the Schmierstelie (11) and - a feed amount measuring device (14) for lubricant (4) in the feed line (5), characterized by a lubricant amount measuring device (16) arranged after the Schmierstelie (11) is.
    [2]
    2. Lubricating device according to claim 1, characterized in that by the lubricant quantity measuring device (16) and the feed quantity measuring device (14) the respectively measured amount of lubricant (Mu. M-ιβ) to a memory (17) of a monitoring device (18) can be transmitted, which the measured and stored amounts of lubricant (Mi4, M16) with each other and a deviation of the amounts of lubricant (M14l Μιβ) from each other a corresponding signal (W), preferably a warning signal outputs.
    [3]
    3. Lubricating device according to claim 1 or 2, characterized in that the lubricant quantity measuring device (16) is arranged in the discharge line (3) and measures the flow rate of lubricant (Mi6) through the discharge line (3).
    [4]
    4. Lubricating device according to claim 1 or 2, characterized in that the lubricant quantity measuring device (16) is arranged in or on a return collecting container (2a) and measures the filling quantity of the return collecting container (2a).
    [5]
    5. Lubricating device according to one of claims 1 to 4, characterized in that the feed quantity measuring device (14) is designed in the form of a metering element which receives via the feed line (5) lubricant (4) and this lubricant (4) of Schmierstelie (11) in definable quantities. 68519 22 / eh
    [6]
    6. Lubricating device according to one of claims 1 to 4, characterized in that the feed quantity measuring device (14) in the form of a pump (8) of the lubricating device is formed which pumps definable or detectable amounts of lubricant (4) in the supply line (5) ,
    [7]
    7. Lubricating device according to one of claims 1 to 6, characterized by - a main supply line (19) for lubricant (4), which leads away from the container (2), - at least two, from the main supply line (19) parallel leading away feed lines (5a, 5b ), each having an inlet quantity measuring device (14a, 14b), preferably in the form of a metering element, wherein via the at least two supply lines (5a, 5b) in each case a lubrication point (11a, 11b) with lubricant (4) can be supplied, - at least two from the lubricating stiffeners (5a, 5b) parallel leading away discharge lines (3a, 3b) for lubricant (4) and - at least one, after the respective lubrication point (11a, 11b) arranged lubricant quantity measuring device (16).
    [8]
    8. A lubricating device according to claim 7, characterized in that in each of the at least two drain lines (3a, 3b), a lubricant amount measuring device (16a, 16b) is arranged.
    [9]
    9. injection molding machine (1) with a lubricating device according to one of claims 1 to 8. Innsbruck, 18 August 2010
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